<style>
  .controls-header {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
  }

  .controls {
    font-size: 0.8rem;
  }

  #help {
    opacity: 1;
    position: absolute;
    margin: 0 auto;
    text-align: left;
    z-index: 1;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 10px;
    border-radius: 10px;
    user-select: none;
    pointer-events: none;
    transition: opacity 0.5s;
  }
</style>
<div id="help">
  <h3 class="controls-header">Controls (click to dismiss)</h3>
  <p class="controls">Drag to stir the fluid.</p>
</div>
<canvas></canvas>
